Lane reversal happens only in the FIA module for TBT-alt/DP-alt mode, so
WARN if lane reversal is attempted at a different level. See the
BSpec DDI_BUF_CTL register description.
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 8b5350931d16..747b68037fea 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3604,6 +3604,8 @@ static void intel_ddi_set_fia_lane_count(struct intel_encoder *encoder,
u32 val = I915_READ(PORT_TX_DFLEXDPMLE1);
bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
+ WARN_ON(lane_reversal && dig_port->tc_mode != TC_PORT_LEGACY);
+
val &= ~DFLEXDPMLE1_DPMLETC_MASK(tc_port);
switch (pipe_config->lane_count) {
case 1:
--
2.17.1
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